Fig. 4
From: Testing allometric scaling relationships in plant roots
SMA results of the relationship between plant fine root productivity (P) and biomass (M) among life forms. Values are log-transformed (base 10). The lines show the fitted regression equations for forbs: log10P = 0.238 + 0.74 × log10M (95% C.I. for slope is 0.32 to 1.69, r2 = 0.75, n = 5); graminoids: log10P = − 0.036 + 0.93 × log10M (95% C.I. for slope is 0.81 to 1.06, r2 = 0.85, n = 38); shrubs: log10P = 0.043 + 0.83 × log10M (95% C.I. for slope is 0.66 to 1.05, r2 = 0.83, n = 16); trees: log10P = − 0.050 + 1.03 × log10M (95% C.I. for slope is 0.97 to 1.09, r2 = 0.40, n = 702). The short dash lines refer to the 95% confidence intervals. The pink line refers to the 1:1 line